Unless of course if someone walks up and closes your shutter. Then if you don't have a key with the head to open it you have a problem. The magnetic head is not needed to close the shutter but it is needed to open it. That is unless you have gone in and removed the companion magnets from the shutter assembly.Took only a couple of minutes to do, and now works perfectly. I never use the lock cover anyway, so the lack of magnets is not a concern to me.